Yes you're right this issue is known and we're trying to figure out a solution for this. Instead of sending the qwerty letters, windows sends the decimal block key codes ... Maybe we need a switch in the configuration.
I have a Smartphone with qwerty keyboard (Samsung Blackjack/i600)
When entering text (or numbers) i cannot use the qwerty keyboard.
Since my keyboard doesn't even have printed letters for the number buttons (1=ABD etc.)
I takes a whole lot of guesswork or trial&error to fill the field!